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While your lawn will reap the benefits of core aeration faster than liquid aeration, the liquid solution will last longer and have more cumulative effects. If your lawn is in really bad shape, try both. By creating holes in the soil with the core aerator, you’ll make it easier for your lawn to absorb the liquid aerator solution. You might have to apply the liquid aerator several times during the growing season, but again, the positive results will be more cumulative than with core aeration on its own.

If you have a beautifully thriving yard with no bald spots, you can choose to aerate your yard once every two years. Otherwise, having your lawn aerated at least once a year is recommended. And in those circumstances where you have a significant amount of thatch buildup or a thinning and bald yard, it's best to aerate twice a year to maintain a healthy lawn.

Try the tool test first. A screwdriver or a similarly long, thin tool will work best, as spades and shovels are too big. If something still seems off despite the screwdriver smoothly going into the soil, look for other signs that you need aeration, like thinning grass, discolored areas, and puddles forming on your lawn after light rain. This indicates poor drainage because of too many areas being compacted.

Don't pick up or dispose of aeration plugs. They will break down by themselves in one or two weeks. Rainfall will speed this up, as will watering the lawn. Mowing helps, but don't mow the grass too soon post-aeration. It's unusual that the plugs would remain after three or four weeks, but mowing and raking will break them down by that point.